Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 103,245	$ (22,001)	$ 582,662	$ (282,140)
Deferred tax benefit (expense)	(9,984)	1,205	(62,415)	20,497
Deferred tax benefit (expense), other-than-temporary impairment	(25)	(69)	122	(145)
Total URA(D) on securities arising during the period	93,236	(20,865)	520,369	(261,788)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	103,173	(22,073)	584,333	(282,479)
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 72	$ 72	$ (1,671)	$ 339

Cumulative Other Than Temporary Impairment Adjustment Deferred Tax Benefit Expense.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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